Some patients with left ventricular systolic dysfunction (LVSD) have an inefficient pumping function. These patients have been shown to benefit from a device therapy known as biventricular pacing. Biventricular pacing causes a more coordinated contraction of the heart chambers resulting in improvement in the pumping ability of the heart and blood pressure. Cardiac Resynchronization Therapy (CRT) has established itself as a proven therapy for congestive heart failure in adults, patients showing improvement in exercise tolerance, quality of life, and survival.